Frost history / Okmulgee Wtr Wks, OK
Okmulgee Wtr Wks, OK: frost dates by year
Last spring and first fall frost at NOAA station USC00346670, 1951 to 2010, measured from daily minimum temperatures.
Elevation 647 ft, 35.624, -96.025. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 2 | Oct 29 |
| Earliest | Mar 5 (1985) | Oct 1 (1984) |
| Latest | Apr 22 (1982) | Nov 20 (2001) |
| Trend | 1.8 days earlier per decade | little change (less than half a day per decade) |
| Years with data | 40 | 45 |
At 28°F (hard freeze) the median last spring date is Mar 23 and the median first fall date is Nov 4.
The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.
Chart
Last spring frost (32°F)
First fall frost (32°F)
Dots are single years. The gray line is the median, the green line the fitted trend.
Year by year
| Year | Last spring 32°F | First fall 32°F | Last spring 28°F | First fall 28°F |
|---|---|---|---|---|
| 2010 | Mar 29 | no data | Mar 3 | no data |
| 2001 | Mar 6 | Nov 20 | Feb 23 | Dec 9 |
| 2000 | Apr 9 | Oct 8 | Mar 12 | Oct 9 |
| 1999 | no data | Oct 18 | no data | Nov 3 |
| 1998 | Mar 13 | Nov 11 | Mar 13 | Dec 10 |
| 1997 | no data | Oct 28 | no data | Nov 11 |
| 1996 | Apr 6 | Nov 2 | Apr 6 | Nov 3 |
| 1995 | Mar 10 | Oct 24 | Mar 10 | Nov 3 |
| 1994 | Apr 9 | Oct 26 | Apr 9 | Oct 27 |
| 1993 | Apr 2 | Oct 25 | Mar 14 | Oct 30 |
| 1992 | Apr 3 | Nov 6 | Apr 3 | Nov 6 |
| 1991 | Mar 31 | Nov 1 | Mar 15 | Nov 2 |
| 1990 | no data | Oct 22 | no data | Oct 22 |
| 1989 | Apr 11 | Oct 19 | Apr 11 | Oct 19 |
| 1988 | Mar 30 | Nov 16 | Mar 19 | Nov 17 |
| 1987 | Apr 5 | Oct 12 | Apr 4 | Oct 12 |
| 1986 | no data | Nov 11 | no data | Nov 11 |
| 1985 | Mar 5 | Nov 20 | Feb 15 | Nov 20 |
| 1984 | Mar 20 | Oct 1 | Mar 20 | Nov 11 |
| 1983 | Apr 16 | Nov 11 | Apr 15 | Nov 24 |
| 1982 | Apr 22 | Oct 22 | Mar 27 | Oct 22 |
| 1981 | Apr 6 | Oct 24 | Mar 20 | Oct 24 |
| 1980 | Apr 15 | Oct 25 | Apr 15 | Oct 25 |
| 1979 | Apr 5 | no data | Mar 25 | no data |
| 1978 | Mar 27 | no data | Mar 27 | no data |
| 1977 | Mar 23 | Oct 12 | Mar 22 | Oct 12 |
| 1976 | Apr 1 | Oct 6 | Apr 1 | Nov 1 |
| 1975 | Apr 4 | Oct 19 | Apr 3 | Oct 26 |
| 1974 | Apr 5 | Nov 15 | Mar 24 | Nov 25 |
| 1973 | Apr 11 | Oct 29 | Feb 22 | Dec 6 |
| 1972 | Apr 1 | Nov 8 | Apr 1 | Nov 22 |
| 1971 | Apr 14 | Nov 7 | Apr 7 | Nov 7 |
| 1970 | Mar 27 | Nov 5 | Mar 27 | Nov 15 |
| 1969 | no data | Nov 3 | no data | Nov 14 |
| 1966 | no data | Oct 16 | no data | Oct 16 |
| 1964 | Apr 9 | no data | Mar 30 | no data |
| 1963 | Mar 22 | Nov 2 | Mar 1 | Nov 13 |
| 1962 | no data | Nov 4 | no data | Nov 9 |
| 1961 | no data | Oct 26 | no data | Nov 4 |
| 1960 | Mar 26 | Oct 20 | Mar 23 | Nov 9 |
| 1959 | Mar 22 | Nov 5 | Mar 22 | Nov 6 |
| 1958 | Mar 27 | Nov 18 | Mar 14 | Nov 18 |
| 1957 | Apr 14 | Oct 26 | Apr 13 | Oct 26 |
| 1956 | Mar 20 | Nov 9 | Mar 12 | Nov 9 |
| 1955 | Mar 29 | Nov 3 | Mar 29 | Nov 3 |
| 1954 | no data | Oct 30 | no data | Oct 30 |
| 1953 | Apr 19 | Nov 9 | Apr 16 | Nov 9 |
| 1952 | Apr 10 | Oct 7 | Mar 23 | Oct 7 |
| 1951 | Apr 17 | Oct 24 | Mar 21 | Nov 2 |
"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.